Tx comment encrypt

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• 4c9798ea - [RFC17] fix some typos

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resolved all threads

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• 2ba9f53c - [RFC17] fix R computation

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• f95d0bf5 - [RFC17] add conversion ed25519 -> x25519

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• c969e94c - [RFC17] full rework: hide message length + add magic value + add version

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• 6b4ad737 - [RFC17] full rework: hide message length + add magic value + add version

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• b7884261 - [RFC17] full rework: hide message length + add magic value + add version

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• f9280d6c - [RFC17] full rework: hide message length + add magic value + add version

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added 1 commit

• b4d76265 - [RFC17] decrease scrypt parameter r

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added 1 commit

• fc7aab83 - [RFC17] fix: encryption algo is incorrect

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added 4 commits

• c1c257c3 - [RFC17] reworf presentation and add example values
• c1ea54e9 - Merge branch 'tx_comment_encrypt_add_example' into tx_comment_encrypt
• f4ecdaee - [RFC17] fix: secret key conversion: must use crypto_box_seed_keypair
• 83586a16 - [RFC17] comment encoding must be in base64 without padding

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added 18 commits

• 83586a16...1a1adf15 - 2 commits from branch master
• 3a35fd82 - create rfc 17
• 104c49ae - [RFC17] change base z85 -> base 64
• 3bbe0d07 - [RFC17] precise prefix conventions
• cb927331 - [RFC17] nonce is salt
• 8bd1be5b - [RFC17] comment message is UTF8 encoded
• 88832550 - [RFC17] add section "hide real length of the message"
• 26a27037 - [RFC17] fix some typos
• 5376a54b - [RFC17] fix R computation
• 62a7e3a4 - [RFC17] add conversion ed25519 -> x25519
• b5b0b66e - [RFC17] full rework: hide message length + add magic value + add version
• 91b89fbd - [RFC17] decrease scrypt parameter r
• a6e8004b - [RFC17] typo: nonce is 16 bytes len
• dd3b6d9f - [RFC17] fix: encryption algo is incorrect
• 44a1ef08 - [RFC17] reworf presentation and add example values
• 8a139ad0 - [RFC17] fix: secret key conversion: must use crypto_box_seed_keypair
• f69b3823 - [RFC17] comment encoding must be in base64 without padding

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added 1 commit

• 22361958 - [RFC17] add regex to quickly recognize if a comment fits this format

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That's basically a block cipher in CTR mode using PBKDF2 as key scheduler and without diffusion.

This should NOT be used without proving it's secure! Modern ciphers like AES-GCM or Chacha20 should be used instead.

I think this can be closed.